has

Checks if a global variable exists.

Methods has(key)

Purpose: This method is used to verify the existence of a global variable in the Node.js global object. It allows you to determine if a variable has been set globally without retrieving its value.

Parameters:

• key (string): The name of the global variable you want to check. This should match the key used when the variable was set.

Returns: true if the global variable exists, otherwise false.

Usage Example:

const globalManager = require('global-manager');

// Set a global variable
globalManager.set('appName', 'MyApp');

// Check if the global variable exists
const exists = globalManager.has('appName');
console.log(exists); // Output: true

// Check a non-existent global variable
const nonExistent = globalManager.has('nonExistentKey');
console.log(nonExistent); // Output: false

Detailed Explanation: The has method checks if a specified key exists in the global object. It is useful for conditional logic where you need to perform actions based on whether a global variable is set. This method helps avoid potential errors or unnecessary operations by confirming the existence of a variable before attempting to use it.

Notes:

• Ensure that the key provided matches exactly (including case sensitivity) with the key used when the variable was set.

• Using has before get can prevent attempting to access undefined variables and handle cases where a variable may or may not be set.